2. how to backup your original firmware customizationa) if you do not want to lose warranty of your phone, first thing you have to do is to backup your original customizationb) download Sony PC Companionand connect your phonec) select update your phone in Sony PC Companiond) application will prompt you to disconnect your phone before starting downloading firmware, just make it (remember - dont disconnect your phone when update just start...)e) after finish downloading firmware cancel the updateF) after that, go to C:\ProgramData\Sony Mobile\Update Engine\db\some number\blob_fs, there you find 3 (maybe 4) files, which names start FILEg) download and install latest Flashtool fromthis articleh) paste the three files, which names start FILE, from blob_fs folder to folder „Firmware“ included in the XPERIA Flashtooli) open the Flashtool, click on Advanced, choose decrypt files and put all three files from blob_fs folder to the right colummj) click ok and after approx. one minute a pop up Window will appear via Flashtoolk) mark all files except simlock.ta and transfer them to the right column, than fill in a box in the right upper corner (fill in what you want, it is just for you)l) now click ok and Flashtool will create backup of your original firmware customization, that you can anytime flash to your phone

3. how to unlock your bootloadera) download and install latest Flashtool fromthis articleb) start Flashtool and click on BLU button on the topc) turn off your device and when Flashtool shows pop up window, connect device to PC with holding volume down buttond) Flashtool will check your device and than you need to connect your device once more, now with holding volume up buttone) click on get unlock key button, it will switch you to Sony Mobile website, here select your phone and hit continuef) fill your email adress and accept terms and conditions, than click submitg) go to your mailbox and click on Click here to proceeed link in mail from Sony Mobileh) copy IMEI from Flashtool to Sony Mobile site and once more accept term and contidion, than click submiti) copy unlock key to Flashtool window and than click unlockj) your device is unlocked